[llvm] TableGen: Split RuntimeLibcallsEmitter into separate utility header (PR #166583)

[Matt Arsenault via llvm-commits]

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@@ -0,0 +1,93 @@
+//===- RuntimeLibcalls.cpp ------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "RuntimeLibcalls.h"
+#include "llvm/TableGen/Error.h"
+
+using namespace llvm;
+
+RuntimeLibcalls::RuntimeLibcalls(const RecordKeeper &Records) {
+  ArrayRef<const Record *> AllRuntimeLibcalls =
+      Records.getAllDerivedDefinitions("RuntimeLibcall");
+
+  RuntimeLibcallDefList.reserve(AllRuntimeLibcalls.size());
+
+  size_t CallTypeEnumVal = 0;
+  for (const Record *RuntimeLibcallDef : AllRuntimeLibcalls) {
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arsenm wrote:

This is just moving the code, not looking to sneak in other changes 

https://github.com/llvm/llvm-project/pull/166583